22 May 2002

B5-01 Catalyst-assisted chemical heat pump for upgrading low-quality heats

A chemical heat pump system has been proposed for upgrading waste heats of 90°C to 200°C with use of catalytic dehydrogenation of 2-propanol and acetone hydrogenation and also by using catalytic methanol decomposition and synthesis from 200°C to 250°C at the sacrifice of heat removal with the ambience for both reaction couples. In order to attain high thermal efficiencies, superheated liquid-film states were indispensable for the catalyst at the endothermic side. The Aspen plus process simulation to estimate the thermal efficiencies of this chemical heat pump was applied, from which dehydrogenation conversions and total pressures were elucidated to be very important as variable parameters.